Polycarbonate (PC) is one of the five engineering plastics (PC, PBT, NYLON, POM, denatured PPE), in the five engineering plastics, PC is a variety of properties more balanced, less shortcomings of plastics, PC is very widely used, currently the most used in electrical, mechanical and other uses. The most attractive feature of PC is its excellent transparency, impact resistance and heat resistance.

Characteristic

Among all engineering plastics, PC is a plastic with the most characteristics and a fairly good balance of various physical properties, and the main representative characteristics are as follows

1. The mechanical strength is well, especially the impact strength is very well

◆The effect of glass fiber on the physical properties of PC and the characteristics of PC: For PC, glass fiber and carbon fiber are good reinforcing materials, but due to the price of glass fiber is cheaper, there are more specifications on the market to add glass fiber, for example, when adding 30% glass fiber, the effect on the physical properties of PC is shown in Table 1.

◆Good mechanical strength: PC has excellent impact strength, among the five major engineering plastics, PC has the best impact strength, this characteristic makes PC can be applied to many products with strict requirements for impact strength, such as: power tool shells, toolboxes, car door handles, lampshades, helmets, as shown in Table 2.

2. Good electrical insulation: the electrical properties of the PC such as the inherent impedance of the volume, the strength of insulation failure and the arc resistance are quite good, as shown in Table 3, add 30% glass fiber PC,Its insulation failure voltage can reach 18KV/mm, which is high among the five engineering plastics. PC is a hydrophobic plastic, its water absorption rate is small, humidity has almost no effect on the electrical properties of PC.

3. It can maintain excellent physical properties from low temperature to high temperature, and can be used in a wide range.

◆Good heat resistance, wide temperature range can be used According to the ASTM D-746-57T test method, the embrittlement temperature of PC can reach -30 °C or less, which is a plastic that can maintain quite good physical strength at low temperature.

The heat resistance properties of PC are quite excellent, especially the UL long-term heat resistance temperature of PC is better among the five general-purpose engineering plastics ,second only to PBT and better than NYLON6, POM and denaturing PPE, PC with 30% glass fiber can be used for a long time in a wide range (-30 °C ~ 130 °C), and is a plastic with heat resistance, as described in Table 4.

4. The dimensional stability is very good, and it is not affected by temperature and moisture

◆Good dimensional stability, very little affected by temperature and moisture, the size stability of PC is excellent among the five engineering plastics, the factors affecting the dimensional stability of plastics are water absorption, creep deformation and heat shrinkage, etc., and their impact on the size change of PC is shown in Table 5.

5. Since it is a colorless and transparent, it can be freely colored to obtain a finished product with a good appearance gloss.

6. It has its own self-extinguishing property, which can have a flame retardant effect itself.

◆Good flame retardancy

未添加難燃劑之 PC 樹脂即具有自己消火性，如表六所示，且 PC 亦是一種可以藉添加難燃劑來得到良好難燃效果之塑膠，經選擇適當之難燃劑，PC之難燃性可以達到 UL94V-0 之水準 ( 如南亞 PC-531P PC-5420 等規格 )。

Molding condition

Dry：120°C 3~4hr

Injection temperature：260~300°C

Mold temperature：80~120°C